Corten Steel Grade A588 Plates, SA588 Grade A Corten® Steel Plate, Corten SA588 Grade B Weathering Resistant Steel Plates, SA588 Grade C Plate. Priminox Overseas is one of the pioneer supplier and trader of quality Corten Steel A588 / A242 Grade Plates , which is the low carbon version of other alloys and can be hot formed to almost any shape.